Harman P68 Installation & Operating Manual

8
P68 Pellet Stove
Venting
A combustion blower is used to extract the
combustiongasesfromtherebox.Thiscausesa
negativepressureinthereboxandapositivepres-
sure in the venting system as shown in Fig. 7. The
longer the vent pipe and more elbows used in the
system, the greater the ow resistance. Because
of these facts we recommend using as few elbows
as possible and 15 feet or less of vent pipe. The
maximum horizontal run should not exceed 48".
If more than 15 feet of pipe is needed, the interior
diameter should be increased from 3" to 4" because
alargerpipecauseslessowresistance.Be sure
to use approved pellet vent pipe wall and ceiling
pass-through ttings to go through combustible
walls and ceilings. The use of a starting collar is
notalwaysnecessary.Therstpieceofpipeshould
be fastened securely with at least 2 fasteners to the
uecollarofthestove.Ifastartingcollarisusedto
attach the venting system to the stove, the starting
collar must be sealed to the stove with high temp
silicone caulking.
Vent Pipe
Pellet venting pipe (known as L or PL vent)
is constructed of two layers with air space between
the layers. This air space acts as an insulator and
reduces the outside surface temperature to allow
a clearance to combustibles of 1 to 3 inches. The
sections of pipe lock together to form an air tight
seal in most cases. However, in some cases a
perfect seal is not achieved. For this reason and
the fact that the P68 operates with a positive vent
pressure we specify that the joints also be sealed
with silicone. Aluminum tape can also be used for
any joint that is 1ft. or more from the outlet of the
stove.
We cannot emphasize enough, the
importance of sealing every seam and joint in the
venting system which is inside the home. Even the
smallest pin hole can leak and when it does you will
smell wood smoke or a creosote smell in the room.
If this occurs check for leaks. Leaks are easiest
to see during start-up. Alternatively you can use a
smoke pellet to leak test the venting before lighting
yourrstre.
Venting
IMPORTANT NOTICE
Approved Pellet Vent Pipe Such As, Type "L"
Or "PL", Must Be Used.
= Positive Static Pressure
= Negative Static Pressure
+
+
-
+
-
Fig. 7

Harman P68 Specifications

General

Brand	Harman
Model	P68
Category	Pellet stove
Language	English